4.5⭐️ Really happy with these two DSG slabs🫡 The Pokémon Cinccino ex Special Illustration Rare came back Gem Mint 10 — looks clean and the presentation is sharp. The MTG Heroes in a Half Shell (Mythic Borderless Surge Foil) got a solid Mint 9, which feels accurate for a foil of this style. What stands out most is the slab quality. These polycarbonate holders feel more durable and substantial than a lot of PSA cases I’ve handled — good UV protection, tight fit so the card doesn’t rattle, and the labels are clean and easy to read with the diamond logo and cert numbers. The detailed grade reports (with the 32 sub-grades and imaging) are a nice touch if you actually want to understand why a card graded the way it did. Turnaround and communication have been reliable in my experience, and the flat pricing is refreshing plus the store had cool items of magic the gathering
Diamond Service Grading
Diamond Service Grading at a glance
Google reviewers rate Diamond Service Grading 4.7 out of 5 based on 26 reviews, with the owner responding to 92% of feedback. Customers frequently praise the durable polycarbonate slabs, accurate grading reports that explain assessments, and prompt turnaround times compared to competitors. Staff are described as knowledgeable and helpful, often facilitating in-person submissions. However, low-star reviews cite concerns about card security within older slabs and allegations that submissions were switched, indicating inconsistent quality control for some clients.
- Google rating: 4.7 out of 5 from 26 reviews (88% five-star).
- Reviews on this page: 26 Google reviews (23 with written comments, 10 with photos).
- Owner responses: the business replied to 92% of reviews.
- Most recent review: October 17, 2026.
- Service: Grading Service serving Novato, California.
Data from Google, last updated October 27, 2026.
Photos
Customer reviews
Reviews from Google, shown as published (original wording, unedited).
What customers talk about
We read 23 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“The detailed grade reports (with the 32 sub-grades and imaging) are a nice touch if you actually want to understand why a card graded the way it did.”
“They are very nice, fast and give you great product at a great price.”
“Turnaround and communication have been reliable in my experience, and the flat pricing is refreshing plus the store had cool items of magic the gathering”
“I brought down 6 cards to get graded by DSG which is only about 7 miles from my house and had a great experience.”
“We received them in about 12 days and got great grades, the cards are worth much more now and the process was simple and efficient.”
“Just went today for the first time; talked to the owner, awesome guy, awesome staff, highly recommended.”
People customers mention
- Pok 4 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
They may have gotten better but I have some slabs from 2021 and they are absolutely dog shit. The card is not secure in anyone of my slabs and moves around.
Come here for grading!!! Don't send cards through the mail to PSA. No mailing needed, no stress, great rates. The card/memorabilia store they operate out of is awesome too! Everybody knows what they're doing. Just went today for the first time; talked to the owner, awesome guy, awesome staff, highly recommended.
Nick, thank you so much for the great review. It was awesome meeting you. I look forward to seeing you again soon.
I recently got into collecting sports cards. I brought down 6 cards to get graded by DSG which is only about 7 miles from my house and had a great experience. 3 of my 6 got 10s and I knew a few of the other cards would not as they are a bit older. I dropped the cards off on a Sunday and they called me the following Wednesday to pick them up. They are very nice, fast and give you great product at a great price....I will be using them exclusively going forward!
Matthew, thank you for the 5 star review. We here at DSG GRADING know it's the collectors that are most important and customers deserved great customer service.
First time using DSG and will again fairly soon. My son and I went to a card show in Burlingame in early January 2026 to get him some nice starter Pokémon cards for his collection, we picked up the Pikachu Zenith for $30, his first deal, I just grabbed the Jordan for $10 since it was in good condition. We used the onsite kiosk to get the cards graded since we’ve never done that before, staff was nice and informative. We received them in about 12 days and got great grades, the cards are worth much more now and the process was simple and efficient. I might even drop cards off if that’s an option as we are about 90mins away and never get over to Eastbay. Very happy!
Thank you for the great review. We look forward to taking care of your grading for many years too come.
I had a great experience with DSG. I found them after picking up one of their slabs in a trade. The slabs are very nice,look great and definitely feel more durable and heavy duty than my PSA slabs. I love the grading reports that break down why your card graded the way it did. Their service was prompt and my cards were graded and shipped back to me in the exact time frame promised(10 buisness days). I hope they gain some much deserved recognition in the hobby. I will definitely use DSG again for my grading needs in the future.
Casey, thank you for your support and your awesome review. Have a grate day. See you again soon.
Professional,accuracy ,AI ,great Company to grade cards of all sorts.
John, Thank you for the great review. Our #1 goal is to make collectors like you happy. Thank you for choosing us.
WOW, so much confidence in Diamond Service Grading,that I had them grade my Pete Rose cards from childhood. Professional, and trustworthy Thanks Rod Aguilar
Rod, we are proud you choose us to grade your most prized cards in your collection. We will always be here when you need us. Thank you for choosing Diamond Service Grading.
I love DSG. After dealing with PSA, SGC and others, I can say that DSG is my favorite. Submission is easy and no upcharge! Please don’t change that. I had to pay $250 to grade a card at SGC. Diamond is very accurate and just as if not more accurate than the “leaders” in the industry. I also LOVE the report with the card as opposed to just accepting what they say with no reason. I really hope a DSG GM10 is the same as a PSA/SGC/Beckett very soon because I personally think they are better. Still hoping for a 10 from them! My best is a 9.5 -James (happy customer)
James, thank you for the 5 star review. Our goal is to improve industry standards, accountability and customer service. We strive everyday to make our customers enjoy their hobby and have fun with fast, accurate and transparent grading.
Thank you all at DSG!!! Absolutely phenomenal!!! Slabs are immaculate. They are airtight, nearly indestructible, as well as infused with uv resistance. The .5 system means, a more accurate grading assessment. It uses professional human and computer algorithms to help assess the grading process. Instead of guessing why my cards came back better or worse than I thought, I can check it out on my own. That is amazing. I hate the guessing game. The turn around time is so fast. I posted pictures. Im sure you can tell, since my first slab from DSG, I have been impressed. I will add the Star Trek set slabs I have in when it comes back to me!
Nate, thank you for taking the time to leave a 5 start review. We appreciate you as our customer and look forward to many great years of talking care of your grading needs.
Business details
- Phone: (707) 755-7101
- Website: dsggrading.com
- Service area: Novato, CA